@leftWidth: 152px;
@topHeight: 48px;
@rightWidth: 280px;
@minHeight: 450px;
.builder_box {
  position: relative; // min-height: @minHeight;
  padding-top: @topHeight;
  margin: -16px;
  background-color: #f0f3f6;
  .form_topbar {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: @topHeight;
    line-height: @topHeight;
    background: #FCFCFC;
    box-shadow: 0px 2px 8px 0px rgba(0, 0, 0, 0.05), inset -1px -1px 0px 0px rgba(0, 0, 0, 0.05);
    z-index: 1;
  }
}